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Fault finding - mechanical breaker ignition system, Ignition system 4•9 – FIAT Uno 45 User Manual

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Fault finding - mechanical breaker ignition system

Ignition system 4•9

4

Engine fails to start

Loose battery connections

Discharged battery

Oil in contact points

Disconnected ignition leads

Faulty condenser

Engine overheats, lacks power

Seized distributor weights

Perforated vacuum pipe

Incorrect ignition timing

Engine starts and runs but misfires

Faulty spark plug

Cracked distributor cap

Cracked rotor arm

Worn advance mechanism

Incorrect spark plug gap

Incorrect contact points gap

Faulty condenser

Faulty coil

Incorrect timing

Poor engine/transmission earth connections

Fault finding - Digiplex (electronic) ignition system

Engine fails to start

Excessive gap on TDC sensor

TDC or engine speed sensor short circuited or earthed

Defective ignition control unit

Control unit multi-plug contacts corroded

Defective coil

Engine lacks power, high fuel consumption

Incorrect ignition advance

TDC sensor incorrectly set

Distributor vacuum hose blocked

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